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SAR image change detection method based on rao test

A change detection and imaging technology, applied in image analysis, image enhancement, image data processing, etc., can solve the problems of lack of mathematical theory support, limit change detection accuracy, etc., and achieve high reliability, high precision, and strong adaptability

Active Publication Date: 2021-03-02
CHINA UNIV OF MINING & TECH
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Problems solved by technology

However, the difference method, the logarithmic ratio method and the mean ratio method are all methods defined in a simple and direct manner, and their application in SAR image change detection lacks rigorous mathematical theory support, thus limiting the accuracy of change detection

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  • SAR image change detection method based on rao test
  • SAR image change detection method based on rao test
  • SAR image change detection method based on rao test

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Embodiment Construction

[0033] Below in conjunction with accompanying drawing and embodiment the present invention is described in further detail;

[0034] Such as figure 1 As shown, the SAR image change detection method based on Rao test of the present invention comprises the following steps:

[0035]Step a: As shown in Figure 2(a) and Figure 2(b), acquire two images of different time phases that cover the same geographical area and undergo registration and geometric correction: time phase t 1 The SAR image I1 and phase t 2 The SAR image I2;

[0036] Step b: Make a Rao test null hypothesis H for SAR image change detection 0 : The land cover information has changed between SAR image I1 and SAR image I2, and the effective scattering cross-sectional area is different between SAR image I1 and SAR image I2, with an unknown pattern; make a Rao alternative for SAR image change detection Hypothesis H 1 ; There is no change in the land cover information between SAR image I1 and SAR image I2, and the eff...

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Abstract

The invention discloses a SAR image change detection method based on Rao test, which is suitable for the field of image processing. The steps are as follows: Obtain two SAR images of different phases at two times in the same area, and make the null hypothesis H of the Rao test 0 and the alternative hypothesis H 1 ; Calculate H 0 Calculation of the maximum likelihood estimate of the parameter θ under constraints H 0 The Fisher information matrix of parameter θ under the constraint condition puts H 0 Substituting the maximum likelihood estimation value of the parameter θ under the constraints into H 1 Under the constraints, the same position of SAR image I1 and SAR image I2 contains N 0 The neighborhood joint probability density function of pixels calculates the partial derivative with respect to the parameter θ; generates the difference image D of SAR image I1 and SAR image I2 based on the Rao test Rao ; Generate a change detection result map by thresholding the difference image. This method is based on the Rao test theory, has a complete mathematical basis, and improves the accuracy of detecting the change area of ​​land cover information from two SAR images; it has a good effect on the detection of changes in SAR images.

Description

technical field [0001] The invention relates to an image change detection method, and is especially suitable for a Rao test-based SAR image change detection method in the technical field of image processing. Background technique [0002] Change detection belongs to the field of image processing. It refers to the use of multi-temporal remote sensing images covering the same geographical area to extract the change information of land cover. This technology has been widely used in environmental monitoring, urban research, forest monitoring, agricultural survey and disaster assessment and other fields. The process of remote sensing image change detection can usually be divided into three steps: image preprocessing, generating difference images by comparing multi-temporal images, and difference image analysis. Among them, generating difference images is a key step in change detection. [0003] Compared with optical images, synthetic aperture radar adopts side-view imaging, which...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06T7/00G06T7/11G06T7/136
CPCG06T7/0002G06T2207/10044G06T7/11G06T7/136
Inventor 庄会富范洪冬邓喀中张宏贞郝明于洋花奋奋姚国标
Owner CHINA UNIV OF MINING & TECH